Carburetor



May 15, 1928.

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Patented May 15, 1928.

STEVEN J. GEL-PAS, OI BOSTON, MASSACHUSETTS.

CARBURE'IOB.

Application filed November 4, 1926. Serial No. 146,169.

This invention relates to means for supplying an internal combustionengine with its mixture of air-and a hydrocarbon, as gasoline; and theobject of the invention is the effecting of means whereby the propermixture will be automatically maintained no matter whether much orlittle of the same is admitted; which will ensure a thoroughintermixture of the air and gas; which will provide a'limited supply ofthe fuel available at any moment for an instant starting of the engine,and which will embody other improvements in details of constructionhereinafter set forth.

In the drawings forming part of this specification, Fig. 1 is a centralvertical section through the line 1-1 in Fig. 2. Fig. 2 is a horizontalsection on the line 2-2 in Fig. 1. Fig. 3 is a side elevation of thecarburetor. Fig. 4 is an enlarged sectional elevation of portions of thecarburetor chamber showing the details of the liquid fuel valve andassociated parts.

The gasoline is supplied from a suitable tank to the receiver 1 in awell known manner, the latter being preferably cast as a part of thecarburetor chamber 2 and of the well 3. Axially supported in thischamber is a tube 4 which is in communication with the receiver 1through the conduit 5; and about the tube 4 is secured a larger tube 6whose lower end communicates with the well 3. -Near the 11 per end ofthe tube 6 are a few holes, pre erably six in number, opening throughits lateral wall, and immediately above each hole 7 is a radiallyprojecting shield 9 having a concave under surface and three or morefine holes 10 up through it.

At the. upper end of the inner tube 4 is a valve seat 11 normally closedby a needle valve 12 pressed therein by a helical spring 13. For raisingthis valve and permitting the gasoline to escape from the tube 1, Irovide a small bell-crank lever 14 pivotall y supported at 15 by thewall of the outer tube 6 and enterin a slot 16 in the part 12. The innerarm 0 this lever 14 bears a against a cross pin 17 when its outer arm ispressed in toward the tube. For thus pressing it, a pin 19 penetratesthe wall of the chamber 2 and has a bifurcated end 20 engaging the outerarm of the lever 14.v

or thus operating the pin 19, I provide a cam surface consisting of athin bar 21 adjustably supported at its ends by a swinging arm 22mounted upon the spindle 23 of a throttle valve 24 within the chamber 2above the tube 6; the parts bein so disposed that as the valve isopened, the pin 19 is pressed inward and the needle valve 12correspondingly opened. For the adjustment of the thin bar 21 to renderthe opening of the valves 24 and 12 to accurately correspond, each endfthebar is attached to the wings 25 of the arm "22 by means of a screw26 and nuts 27, 29, whereby each end can be shifted toward and from thewings, and thepush given to the pin 19 can be suitably varied.

For carrying out the objects of this invention, I connect the arm 22 bymeans of a link 30 with a lever 31 fixed on the spindle 32 of a chokevalve 33 which controls the admission of air to the carbuetor; wherebythe opening and closing of the throttle valve 24-simultaneously andsimilarly opens and closes the choke valve 33. Consequently, bothdampers are opened when the valve 12 is opened, and closed when thelatter is closed; and by accurately adjusting the cam surface 21, theamount of gasoline admitted past the valve 12 is proportioned to theamount of air admitted past the damper 33.

I'prefer to provide a pin hole 35 through the inner tube 4', as shown inFig. 1 through which hole when the car is standing, the

asoline slowly percolates until it reaches 1n the well 3 and in the tube6 tothe height of the gasoline in the receiver 1, bu no higher. Then,when the valves 33, 24 are thrown wide open for starting, this smallquantity of the gas is immediately sucked up into the chamber 2 andthence to the engine, and ignites at once. To prevent evaporation of thegasoline thus in readiness for use, it is well to provide a cock 36 inthe well 3 and to close the same in case the car is to stand idle forany considerable length of time. This cock also permits of a regulationof the admitted air.

The purpose of the perforated arms 9 projecting from the outer tube 6 isto more thoroughly intermix the air and issuing gasoline. As the fuel issucked out through the holes 37 and 7, the air, rushing past the armsand through the small holes 10, acts to thoroughly break up andvolatilize the fuel so that it and the air will be made a erfectlyuniform mixture.

at I claim as my invention is:

1. In a carburetor, having two vertical tubes, one spaced within theother, the larger ill) 2. A carburetor as set forth in claim 1, themeans for raising the valve comprising a horizontally movable rodadapted by its movements to raise and lower said valve, a swinging arm,a thin bar and adjusting screws attaching it at an acute angle to oneside of said arm to bear against the exposed end of said rod.

In testimony that I claim the foregoing invention, I have hereunto setmy hand this 3rd day of November, 1926.

STEVEN J. CHAPAS.

